diff --git a/modules/setup/library/Setup/Utils/DbTool.php b/modules/setup/library/Setup/Utils/DbTool.php
index 0d0ebfe9e..2b493af69 100644
--- a/modules/setup/library/Setup/Utils/DbTool.php
+++ b/modules/setup/library/Setup/Utils/DbTool.php
@@ -583,7 +583,7 @@ class DbTool
             $to = sprintf(
                 ' TO %s@%s',
                 $this->quoteIdentifier($username),
-                str_replace('%', '%%', $this->quoteIdentifier($host))
+                $this->quoteIdentifier($host)
             );
 
             $dbPrivileges = array();